Burglar-alarm.



No. 772,150. PATENTED 00T.11,1904.

E. W. JENKS.

.BURGLAR ALARM.

APPLICATION FILED 001217. 1903'.

N0 MODEL.

Patented October 11, 1904.

PATENT OFFICE.

EDWARD W. JENKS, OF CHICAGO, ILLINOIS.

BURGLAR-ALARIVI.

SPECIFICATION forming part of Letters Patent No. 772,150, dated October 11, 1904.

Application filed October 1'7, 1903.

To all whom, it may concern:

Be it known that I, EDWARD W. J ENKS, a citizen of the United States of America, and a resident of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Burglar-Alarms, of which the following is a specification.

The main objects of my invention are to provide a mechanical burglar-alarm adapted to be secured to a door or window and which may be adjusted when the door or window is in its open position and will automatically set itself upon the closing of the door or Window, so as to sound an alarm when same is opened. I accomplish this object by the device shown in the accompanying drawings, in which Figure 1 is a transverse section of adoor and a portion of its frame, showing in position a burglar-alarm constructed according to my invention. Fig. 2 is a front elevation of the burglar-alarm with the bell removed. Fig. 3 is a rear elevation of the same. Fig. 4 is an enlarged section of the trip member and its coacting clip, which is secured to the jamb. Fig. 5 is a side elevation of the clip.

In the drawings the alarm mechanism is shown fastened to the door near one edge of same. The door is represented at 1, while 2 represents a part of the door jamb or' frame. The base or casing 3 of the alarm mechanism. together with the hell 4, forms a housing for the mechanism. A central spindle 5 is revolubly mounted on the base 3, and the hell 4 is threaded thereon, as is common in devices of this class. A flat spiral spring 6 is coiled around the spindle 5, one end being secured to the spindle and the other end being secured at 7 to the base 3. An escapement-wheel 8 is also journaled on the casing 3 and is connected with the spindle 5 by means of a train of gears, as shown. The movement of the escapement-wheel 8 is controlled by an'anchor-pawl 9, to which the bell-hammer 10 is connected by means of a-resilient arm 11 in suitable manner to cause said hammer to strike the bell when the pawl 9 vibrates during the unwinding of the spring 6. The spring 6 is normally wound by turning the bell 4 in right- Serial No. 177,472. (No model.)

handed direction. The unwinding of the spring, and consequent sounding of the alarm, is controlled by means of a detent 12, which is movable into and out of engagement with the arm 11.

On the rear side of the base-plate 3 is slidably mounted a trip member or tongue 13, to which the detent 12 is rigidly secured, said detent projecting through a slot 14 in the side of the base 3. A spring 15, secured to the base 3, engages a lug 16 on the tongue 13 and normally urges the detent 12 away from the arm 11, so as to permit the vibration of said arm. The tongue 13 extends through a slot -17 in the side of the base and is provided with a lug 18, adapted to engage the edge 24 of the slot 17 and hold the tongue 13 in its inward position with the detent 12 in engagement with the arm 11. The slot 17 is of sufficient width to permit the lug 18 to pass through same, and the tongue 13 is loosely mounted on the base 3, so that it may be moved laterally sufficiently to permit the lug 18 to be moved into or out of engagement with the edge of stop 24. A metal clip is secured to the door-jamb in suitable position to be engaged by the tongue 13, the surface 20 of the clip 19 being suitably disposed to engage the tongue 13 and move the lug 18 free from the edge of the slot 17 when the door is in its closed position. The face 21 of the clip 19 forms a shoulder suitably disposed to hold the tongue 13 in position for preventing the sounding of the alarm after the surface 20 has released the lug 18 from the stop 24. A locking-lever 22 is pivotally mounted on the casing 3 and is adapted to engage a notch 23,

on the tongue 13 and secure same against movement under the action of the spring 15 when it is deslred to throw the alarm out of service.

The operation of the device shown is as folright-handed direction and is normally prevented from unwinding through engagement of the detent 12 with the hammer-arm 11. After the spring has been wound the device may be locked in an inoperative position by moving the lever 22 into engagement with the notch 23 on the tongue 13 when such bar has been moved inwardly to bring the detent 12 into engagement with the hammer-arm 11. To set the device into condition for sounding an alarm upon the opening of the door, the lever 22 is moved out of engagement with the .notch 23 and the detent 12 is secured in contact with the hammer-arm by moving the tongue 13 into the base and then moving same laterally, so as to bring the shoulder 18 into engagement with the stop 24. The device is set in this manner while the door is open. The closing of the door brings the tongue 13 into contact with the face 20 of the clip 19 and moves the shoulder 18 out of engagement with the stop 24;, as illustrated in Fig. 4. hen the door is now opened, the tongue 13 will slip off from the face 21 of the clip, moving the detent 12 out of engagement with the hammer and permitting the vibration of the hammer by the escapement mechanism. It is preferred to locate the clip 19 in such manner that the tongue 13 may have a slight outward movement before being engaged by the part 21 of the clip and after the shoulder 18 has been released from the stop 24. The parts thus assume the position shown in Fig. 4, and thus avoids the possibility that friction between the end of the tongue 13 and the clip 19 may cause the shoulder 18 to be accidentally returned to engagement with the stop 24. when the door is opened.

The device is herein shown applied to a door and door-jamb; but it will be understood that it may be also applied to a window and frame or other relatively movable members.

It will be seen that some of the details of the construction shown may be altered without departing from the spirit of my invention. I therefore do not confine myself to such details except as hereinafter limited in the claims.

WVhat I. claim as my invention, and desire to secure by Letters Patent, is

1. In a burglar-alarm, the combination of a pair of relatively movable members; alarm mechanism mounted on one of said members; a tongue on said member having transverse and longitudinal movement thereon and being normally urged outwardly from the alarm mechanism and toward the other of said members; a stop on said other member adapted to hold said tongue inwardly into engagement with the alarm mechanism to stop the operation of same; and means on said other member adapted through contact with said tongue to move same transversely out of engagement with said stop when said members are in a certain relative position, and to prevent the outward movement of said tongue and release of the alarm mechanism until said members are relatively moved from said position, substantially as described.

2. In a burglar-alarm, the combination of a door and frame; alarm mechanism secured to the door; a tongue having transverse and longitudinal movement on the door and normally urged outwardly from the alarm mechanism and toward said frame; a stop on the door adapted to hold said tongue inwardly into engagement with the alarm mechanism to stop the operation of same; and means on the frame adapted through contact with said tongue to move same transversely out of engagement with said stop when the door is closed, and to prevent the outward movement of said tongue and release of the alarm mechanism until the door is again opened, substantially as described.

3. In a burglar-alarm, the combination of a first member supporting the alarm mechanism, and a second member carrying a stop, one of said members being movable relatively of the other; a movable tongue on said first member adapted to prevent the operation of the alarm mechanism when said tongue is in a certain position; a stop on said first member for holding the tongue in position to prevent the operation of the alarm; said tongue having movement into and out of engagement with said stop while preventing the operation of the alarm, and having a second movement, transverse to the first movement, for releasing the alarm; means on said second member for releasing the tongue from the stop on said first member when said members are brought into a certain position; and a stop on said second member adapted to hold the tongue in position to prevent the operation of the alarm after the tongue has been released from the stop on said first member; and means on said first member for urging the tongue out of engagement with the alarm mechanism to permit the operation of the alarm when one of said members is moved so as to free said tongue from the stop on said second member, substantially as described.

4. In a burglar-alarm, the combination of a door and frame; alarm mechanism secured to the door; a movable tongue on the door adapted to prevent the operation of the alarm mechanism when said tongue is in a certain position; a stop on said door for holding the tongue in position to prevent the operation of the alarm; said tongue having movement into and out of engagement with said stop while preventing the operation of the alarm, and having a second movement, transverse to the first movement, for releasing the alarm; means on said frame for releasing the tongue from the stop on the door when said door is closed; and a stop on the frame adapted to hold the tongue in position to prevent the operation of the Signed at Chicago this 15th day of October, allarm after the tongue has been released f'om 1903. Y

1316 stop on the door; an means on tie oor 1 for urging the tongue out of engagement with EDWARD JENKb' the alarm mechanism to permit the operation Witnesses:

of the alarm when the door is opened, sub- EUGENE A. RUMMLER,

stantially as described. GLEN C. STEPHEN. 

